I had this happen on 3 F1220As, all in a stage setup, after a power blackout. The main power amp, an ST TDA7293, was bad in all three. Replaced that and it worked. However, it "thumps" more when turned off now.
Hmmmmm. Are we talking about your internal or external fuses; Do they blow at the moment you put power on it, and what about the switch of the used voltage ?.... And was it straight away , since when you bought them; Then just send them back, Second hand?, too bad, you're ripped off .
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